Work holder



H. H. KlsTNER WORK HOLDER Filed Nov. 1'8. 1924 wat had flfrornasp invento/7,

iis

titl

Patented Dec. 27, 1927..

PATENT OFFICE.

HERMAN H. KISTNER, F ELtIZABETH, NEW JERSEY.

`WORK HOLDER.

Application filed November 18, 195.4.

This invention relates to Work holders for holding a plurality el annular pieces such es piston rings during the iinishing et the inner tace thereof, end aims generally to improve such devices. ln the accompanying drawings, wherein l have selected ler illustrative purposes one embodiment ot my invention,

Fig. 1 a central longitudinali sectional View ol my Work holders showing e plurality ot piston rings assembled therein;

Fig. 2 is :in end elevetion thereof.

In the embodiment oi' my invention shown in the drawings u support or casing is formed with suitable attaching means such :is a ilange 1l, which is suitably bolted or otherwise secured to a lace plete 12 mounted tor rotation upon the spindle 13 ot e lathe or other turning machine. The support or cusing 10 is hollow and the Wall 11i ure grut'lually tapered on the inside toward the outer end.. The outer Ylaee ot the side Wall is threaded at the end sway from the ilenge 117 to secure a cap 15. The end of the support l() abutting the tace plete preferably counterbored es at 1G te receive a shouldered portion 17 on the lace plete, thereby to locate the support centrally with respect to the axis el the spindle 13.` The support 1,0 is provided `with a clamping ring 18 on the inside thereot and near the end abutting the tace plate, und this ring may be i'ormed intt-igrally with the support or seperately therefrom. When made separately :trom the support es shown in the drawings, the ring 18 abuts against an inner shouldered portion 19 at the inner end o1 the support although the ring may be securely locked therein by any other suitable means. Replaceable liners 20 may be provided for the ring 19, the inner diameter of which is slightly less than that of the piston ring to be finished.

A sleeve or gauge 21 is removably positioned in the support `10, and the outer Wall is tapered correspondingly to the tapered Wall 1st of the easing, so that the sleeve 21 will be held tightly and centrally in the casing 10 by the frietionzil contact o'l the walls thereof. The outer end of the sleeve muy be termed with sockets 22 to receive a Spanner Wrench or other tool to turn the sleeve in the support to effect removal there of. lleplaeeable liners 23 are litted Within the sleeve 21 to accommodate piston rings :24 of Varying diameters and this sleeve may serial No. 759,653.

he locked therein by any suitable ineens 2b. rlfhe- 'internal diuineter oi the liners is slightly greater then external diameter et the pistou rh to be linished.

',lfhe clamping nut 1:3, threaded upon the threaded end portion et the support lll, ln'eterably curries 'repleceahle there 15, the inner diameter et' which is slightly.larger than the externul diameter el? the rings to he fnlislnd, and which are held in plate by screws 25.

The support or casing 10 is preferably provided with a plru'ality el openings 'i' het-"weon the :tace plate 12 and the clamping ring 18 'ter the discharge of metal chips alu shavings produced by the cutting tool.

lu the niuinrlecture of piston rings, the rings ure individually nfoduced, as by east- .ing or cutting troni a pattern, and a section is then cut treni one side to torni the gep oi desired length. The rings are thon contracted and cluinped hy side pressure in a mandrel 'tor outside turning es is well unlntrensierrni the rings 'trom the umudrol to the holder ior retaining the rings durii'ig the finishing et the inner face, it is iinpertsnt that the rings ure not` allowed to expand to their normal slnipe es erich efri pension und contraction el the ring during `its serni--tinishod shape redistriliutes tl e strains und stresses el" the metal and makes ttor di.` `ortion et the metal, which is undesirable.

rliccerding to the present invention the sleeve 2l is placed over rings clamped on the inundrel, und when the side pressure is relieved the rngs ere permitted to expand .slightly into contact with the inner :tace o'l' the sleeve. The sleeve and assembled rings therein are then placed in the support 10 end the nut is tightened. The rings are thus clamped by side pressure between the liners and 15 ready ltor the finishing of the inner face thereof.

Obviously the support may be rotated or held stationery during the finishing opera tion according to the nature ol' the iinishing tool. Chips and shavings will be discharged trom the casing through the openings 27, thereby preventing metal particles from becoming deposited on the tapered Well 14s et the easing.

By the use ot my holder the transfer of the rings from the mandrel may be accomplished es one operation, which has advan- Yon the support adapted to engage and clamp said rings Within said open ended member' `by pressure exerted from opposed sides of said rings.

2. Means for assembling and holding piston rings in contracted position to be machined on the inner faces thereof, comprising a hollow support, an open ended member having a vcylindrical boreadapted to receive the rings and to be fitted and centered .Within the support, and relatively adjust- ;able means on the support adapted to engage and clamp said rings Within and independently of said-open ended member by pressure exerted from opposed sides of said rings.

3. Means for rassembling and holding piston rings in contracted position to be machined onY the inner faces thereof, comprising a hollow support, an open ended member having a cylindrical bore adapted to receive the rings and to be fitted and centered lWithin the support, said support and open ended member having oppositely tapered coacting surfaces for centralizing said member in said support, and relatively adjustable means on the support adapted to engage and clamp said rings Within said open ended member by pressure exerted from opposed sides of said rings.

'4. A holder for Work of the character described, comprising a casing having a bore, a removable sleeve Within said bore adapted to have the Work assembled therein, means in said casing for limiting the inward movement of said sleeve and work, and means adjustable on said casing for clamping said work against said limiting means, said adjustable means, sleeve and limiting means having replaceable liners adapted to receive and hold Work of varying diameters.

5. A work holder for supporting piston rings and the like with their inner aces unobstructed and ready for finishing, comprising a casing, a sleeve mounted within said easing, means for clamping the rings in said sleeve and easing by side pressure, the inner end of the casing being formed as a pocket for receiving chips and shavings, and passage means communicating with said pocket for discharging the chips and shavings from said pocket.

6. A Work holder for supporting piston rings with their inner faces unobstructed and ready for finishing, comprising a face plate, a casing secured to said face plate and having a tapered bore, a tapered sleeve adapted to hold the work and fitted in said bore, a stop member in said casing for limiting the inward movement of the sleefe and rings, and a clamping member threaded upon the outer end of the casing having a shouldered portion for engagement with the rings held in the sleeve and adapted to hold the rings in contracted position against the stop member by side pressure.

7. A Work holder for supporting piston rings with their inner faces unobstructed and ready for finishing, comprising a face plate, a casing secured to said face plate and having a tapered bore, a tapered sleeve adapted to hold the work and fitted in said bore, a stop member in said casing for limiting the inward movement of the sleeve and rings, a clamping member threaded upon the outer end of the casing, and replaceable liners secured to said stop member, sleeve and clamping means, adapted in thickness to secure piston rings of desired diameter Within said holder.

In testimony whereof, I have signed my name to this specification.

HERMAN H. KISTNER. 

